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HL: Fachverband Halbleiterphysik

HL 82: Ultrafast Phenomena

HL 82.7: Vortrag

Donnerstag, 17. März 2011, 16:15–16:30, POT 251

Coulomb-induced relaxation dynamics in single-walled carbon nanotubes — •Eike Verdenhalven, Andreas Knorr, and Ermin Malić — Institut für Theoretische Physik, Technische Universität Berlin, Germany

We investigate the ultrafast Coulomb-induced relaxation dynamics of optically excited charge carriers in arbitrary single-walled carbon nanotubes. Using a density-matrix formalism we derive a corresponding Boltzmann equation in Born-Markov approximation. The bandstructure is obtained using the zone-folded tight-binding wave functions of graphene. Complying with the low dimensionality of nanotubes the Coulomb interaction is treated by a parametric interaction potential. Our approach allows to track (time- and momentum resolved) the relaxation paths of non-equilibrium electrons in metallic and semiconducting nanotubes of arbitrary chirality.